import re

from django_redis import get_redis_connection

from rest_framework import  serializers
from rest_framework_jwt.settings import api_settings
from .models import User, Address

from celery_tasks.mail.tasks import send_verify_email

class CreateUserSerializer(serializers.ModelSerializer):
    """注册序列化器"""

    # 序列化器，需要校验的所有字段：['id','username','password','password2','mobile','sms_code','allow']
    # 需要校验的字段：['username','password','password2','mobile','sms_code','allow']
    # 模型中已存在的字段：['username','password','mobile']

    # 需要序列化的字段：['id','username','mobile']
    # 需要反序列化的字段：['username','password','password2','mobile','sms_code','allow']
    password2 = serializers.CharField(label='确认密码', write_only=True)
    sms_code = serializers.CharField(label='验证码', write_only=True)
    allow = serializers.CharField(label='同意协议', write_only=True)    # 'true'

    class Meta:
        model = User    # 从User模型中映射序列化器
        # fields = '__all__'
        fields = ['id', 'username', 'password', 'password2', 'mobile', 'sms_code', 'allow']
        extra_kwargs = {  # 修改字段选项
            'username': {
                'min_length': 5,
                'max_length': 20,
                'error_messages': {  # 自定义校验出错后的错误信息提示
                    'min_length': '仅允许5-20个字符的用户名',
                    'max_length': '仅允许5-20个字符的用户名',
                }
            },
            'password': {
                'write_only': True,
                'min_length': 8,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许8-20个字符的密码',
                    'max_length': '仅允许8-20个字符的密码',
                }
            }
        }

    def validate_mobile(self, value):
        """单独校验手机号"""
        if not re.match(r'1[3-9]\d{9}$', value):
            raise serializers.ValidationError('手机号格式有误')
        return value

    def validate_allow(self, value):
        """是否同意协议校验"""
        if value != 'true':
            raise serializers.ValidationError('请同意用户协议')
        return value

    def validate(self, attrs):
        """校验两个密码是否相同"""
        if attrs['password'] != attrs['password2']:
            raise serializers.ValidationError('两个密码不一致')

        # 校验验证码
        redis_conn = get_redis_connection('verify_codes')
        mobile = attrs['mobile']
        real_sms_code = redis_conn.get(f'sms_{mobile}')
        # 向redis存储数据时都是以字条串进行存储的,取出来后都是bytes类型 [bytes]

        if real_sms_code is None or attrs['sms_code'] != real_sms_code.decode():
            raise serializers.ValidationError('验证码错误')

        return attrs

    def create(self, validdated_data):
        # 把不需要存储的password2，sms_code，allow 从字段中一处
        del validdated_data['password2']
        del validdated_data['sms_code']
        del validdated_data['allow']
        # 把密码先取出来
        password = validdated_data.pop('password')
        # 创建用户模型对象，给模型中的 username和mobile属性赋值
        user = User(**validdated_data)
        user.set_password(password)     # 把密码加密后再赋值给user的password属性
        user.save()         # 存储到数据库

        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER  # 引用jwt中的叫jwt_payload_handler函数(生成payload)
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER  # 函数引用 生成jwt

        payload = jwt_payload_handler(user)  # 根据user生成用户相关的载荷
        token = jwt_encode_handler(payload)  # 传入载荷生成完整的jwt

        user.token = token

        return user

class UserDetailSerializer(serializers.ModelSerializer):
    """用户详情序列化器"""
    class Meta:
        model = User
        fields = ['id','username','mobile','email','email_active']

class EmailSerializer(serializers.ModelSerializer):
    """更新邮箱序列化器"""
    class Meta:
        model = User
        fields = ['id','email']
        extra_kwargs = {
            'email':{
                'required':True
            }
        }

    def update(self, instance, validated_data):
        """重写此方法目的不是为了修改，而是接用次时机，发激活邮件"""
        instance.email = validated_data.get('email')
        instance.save()

        # 将来需要再次继续写发邮箱功能
        # send_mail()
        # http://www.meiduo.site:8080/success_verify_email.html?token={用户的个人信息}
        verify_url = instance.generate_email_verify_url()
        send_verify_email.delay(instance.email, verify_url=verify_url)

        return instance


class UserAddressSerializer(serializers.ModelSerializer):
    """
    用户地址序列化器
    """
    province = serializers.StringRelatedField(read_only=True)
    city = serializers.StringRelatedField(read_only=True)
    district = serializers.StringRelatedField(read_only=True)
    province_id = serializers.IntegerField(label='省ID', required=True)
    city_id = serializers.IntegerField(label='市ID', required=True)
    district_id = serializers.IntegerField(label='区ID', required=True)

    class Meta:
        model = Address
        exclude = ('user', 'is_deleted', 'create_time', 'update_time')

    def validate_mobile(self, value):
        """
        验证手机号
        """
        if not re.match(r'^1[3-9]\d{9}$', value):
            raise serializers.ValidationError('手机号格式错误')

        return value

    def create(self, validated_data):
        user = self.context['request'].user  # 获取用户模型对象
        validated_data['user'] = user  # 将用户模型保存到字典中
        return Address.objects.create(**validated_data)


class AddressTitleSerializer(serializers.ModelSerializer):
    """
    地址标题
    """

    class Meta:
        model = Address
        fields = ('title',)
